The mini pill containing progesterone only. It is used in women who have a contraindication to estrogen or are breast feeding since combined birth control pills reduce the amount of breast milk produced. These pills work by not preventing ovulation, but by causing thickening of the mucus in the cervix which prevents sperm from passing through. They are highly effective but must be taken at the exact time each day. More than three hours late in taking the mini pill can cause you to become pregnant. It is quite common to have spotting or breakthrough bleeding in the middle of the menstrual cycle.
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